min function in SQLlite returns max value when used in inner join

in sqlite I have two tables named A350AttJustiMax and A350AttJustiMin.
Both have the same number of rows and columns. Columnname are identical.
In the image below you can se the columns Rfx of both tables on the right.
In the second column you see my attempt to get the min RFx out of these two tables, but I get the max RFx in return instead. If i change min() for max() I get what i want but i does not make sence to me…. What am I’m doing wrong?

>Solution :

Redefine the data type of the columns as REAL instead of TEXT, or cast their values to numeric:

MIN(A350AttJustiMin.RFx + 0, A350AttJustiMax.RFx + 0) AS least_val